Somebody mentioned a writer called 'Pook' earlier in this thread and I want to add to that recommendation.
He wrote about relationships on the sosuave.net forums, offering profound (yet very simple) knowledge in an engaging, distinctive style. These posts are excellent and well worth a read (there's a link to those earlier in the thread).
Recently he's started up a blog, where he serves up challenging ideas in his usual humerous way, centering around feminism, relationships and personal development. You can find it here:
Pook's Mill
It's being less frequently updated now, but he's talking about putting up a website this year. Browse the archives!